Year	Number
2004-01-01	15680
2005-01-01	22176
2006-01-01	22968
2007-01-01	17750
2008-01-01	15927
2009-01-01	13712
2010-01-01	13321
2011-01-01	20056
2012-01-01	20158
2013-01-01	25299
2014-01-01	27678
2015-01-01	27202
2016-01-01	35059